On Wednesday, May 7, 2014 1:00:01 PM UTC-5, squeegee wrote: > > > On May 7, 2014, at 12:11 PM, Mars0i <mars...@logical.net <javascript:>> > wrote: > > To me, the fact that BigDecimal is contagious sometimes but not always, > seems confusing in a way that could encourage bugs. The fact that BigInts > are contagious would also lead one to assume that BigDecimals are > contagious. > > > I don’t think it's a case of “sometimes but not always”. Instead there’s a > contagion precedence order such that any type earlier in the order combined > with a type later in the order yields the type later in the order. > > Here’s the order: Long < BigInt < Ratio < BigDec < Double > > Before applying the contagion order, narrower integer types are promoted > to Long, and float is promoted to Double. > > Thanks Steve. That's very clear, and very helpful. It's no longer confusing to me. I still would say that it would be a good thing if precedence order were documented explicitly at clojure.org or another obvious documentation source. There's still some potential for confusion. The rule is not what I would have expected.
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